Diamond Coating and Nickel Alloy Surface Nike - Diamond coating can increase the drilling speed and make the drill bit sharper; the nickel-plated surface can prolong the service life and improve the corrosion resistance of the surface; the thickened diamond coating on the top can provide excellent cutting force to achieve maximum drilling effect. Saw - 16pcs Diamond Bell - Comes with 16 drill bits in different sizes, including 6mm, 8 mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 28mm, 30mm, 35mm, 40mm, 45mm, 50mm. Laser marking, the size will be clearer than other sizes and not easy to wear. Application - Suitable for punching holes in glass, marble, ceramic tiles, block pots, tiles. fiberglass tiles, slate marble, lightweight granite, etc. Will be used with all electric drills and hammer drills. Side Hole Opening and Laser Marking - Side hole design, the drill bit can eliminate waste and keep the bit clean; laser marking, the size mark is clearer and more durable than others,
